I am cleaning out my backyard pond and the bottom is covered in about 2 in of this blackish green scum. There are round white objects that might be eggs, but I don't know of what. Should I continue to clean these out? There a lot of snail shells but no live snails and lots of salamanders living in the scum. Photos attached
I did see a snail shell in the first image. While I don't exactly recognize the white objects, I would remove anything and everything I didn't initially put in the backyard pond. Will save and forward the image to a more knowledgeable person.